add references

Author: tienbku

README.md

@@ -12,12 +12,19 @@ More practice:
 
 > [Deploy Spring Boot App on AWS – Elastic Beanstalk](https://bezkoder.com/deploy-spring-boot-aws-eb/)
 
+Security:
+> [Spring Boot, Spring Security, PostgreSQL: JWT Authentication & Authorization example](https://bezkoder.com/spring-boot-security-postgresql-jwt-authentication/)
+
 Fullstack:
 > [Vue.js + Spring Boot + MySQL/PostgreSQL example](https://bezkoder.com/spring-boot-vue-js-crud-example/)
 
-> [Angular + Spring Boot + PostgreSQL example](https://bezkoder.com/angular-10-spring-boot-postgresql/)
+> [Angular 10 + Spring Boot + PostgreSQL example](https://bezkoder.com/angular-10-spring-boot-postgresql/)
+
+> [Angular 11 + Spring Boot + PostgreSQL example](https://bezkoder.com/angular-11-spring-boot-postgresql/)
+
+> [React + Spring Boot + MySQL example](https://bezkoder.com/react-spring-boot-crud/)
 
-> [React + Spring Boot + MySQL/PostgreSQL example](https://bezkoder.com/react-spring-boot-crud/)
+> [React + Spring Boot + PostgreSQL example](https://bezkoder.com/spring-boot-react-postgresql/)
 
 ## Run Spring Boot application
 ```